Importance

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Abstract

Apparatus is provided to provide a start of frame signal for an incoming bipolar information signal wherein one binary state is alternately encoded with positive and negative level pulses, each of a given duration, and the other binary state is encoded with a zero or reference level. The apparatus responds to said bipolar signal to provide a first series of pulses indicative of positive pulses and a second series of pulses indicative of negative pulses. A clock is provided which operates at a higher frequency than the bipolar signal. Counting means are provided and are responsive to said first and second signals and said clock to provide third and fourth signals each of said signals indicative of the true polarity of the input signal transitions to enable the processing of true data as compared to noise. The output of the counting means are coupled to logic means whereby if two or more successive pulses of the incoming signal have the same polarity, then a start of frame signal is provided by the logic means as coupled to the counting means.

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First Claim